package org.example.config; // 配置包

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.example.model.Result;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if (body instanceof Result) {
            // 如果返回类型为Result类型，直接返回结果
            return body;
        }
        if (body instanceof String) {
            // 如果返回类型为String类型，需要进行处理否则会出bug
            ObjectMapper mapper = new ObjectMapper();
            return mapper.writeValueAsString(Result.success(body));
        }

        // 若为其它类型结果，统一用Result返回
        return Result.success(body);
    }
}
